$ git clone -n https://src.fedoraproject.org/rpms/rust-io-lifetimes1.git /var/lib/mock/f39-build-1929209-43079/root/chroot_tmpdir/scmroot/rust-io-lifetimes1
Cloning into '/var/lib/mock/f39-build-1929209-43079/root/chroot_tmpdir/scmroot/rust-io-lifetimes1'...
$ git fetch origin 4ceed16a1dea255f630c9a4a44a7e1d5bb4f2b10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-io-lifetimes1
 * [new ref]         4ceed16a1dea255f630c9a4a44a7e1d5bb4f2b10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ceed16 Initial import (io-lifetimes 1 compat package)